Brake for truck trailers



May 31, 1932- w. s. GURTON ET AL 1,860,537

BRAKE FOR TRUCK TRAILERS y Filed March 25, 1929 Wfl/iam 5. Gul'on. Jos ep/l Flint. Herman /Vye/g.

In vehors.

'i Patented May '31, 1932 UNITED STATES,

PATENT OFFICE WILLIAM s. GUBTON, JOSEPH PLINT, AND HERMAN NYBERG, or KITCHENER, .oNTAEIo, CANADA, AssIGNons To DoMINroN TRUCK EQUIPMENT co. LIMITED, or KITCHENER,

ONTARIO, CANADA s BRAKE ron TEUC'K TEArLIras Applicationk led March 25, 1929.' Serial N'o.- 349,669.

The principal objects of this invention are to effect av greater factor of safety in the operation of trucks with trailers and to provide a trailer brake equipment which is operated hydraulically yfrom the trucks.

A further and important object of the invention consists in the'simplicity of construction which enables a cheap and reliable installation ofbrake equipment on trailers.

The principal feature of the invention con- Sists in the novel arrangement of a hydraulic Abrake equipment upon the trailer, including a master cylinder, for controlling same, to-

gether withthe means whereby said master truck.

The use of a reliable braking equipment upon .truck trailers is a most desirable condition and many dierent forms of equipment have"been devised in an endeavour to supplyV an adequate brake control.

The present invention is applied to the semi-trailer type of truck in which the trailer member is supported at its forward end by a swivel connection on the truck or tractor.

1n the accompanying drawings, Figure 1 is a side elevational view in part section showing the arrangement of brake equipment as contempla-ted by the present invention.

Figure 2 is a plan view ofthe trailer member.

Figure 3 is an enlarged diagrammatic ara rangement of the preferred form oi" the mechanism.

In the application of the invention herein shown, the tractor or truck 1 is provided "with`a fifth wheel 'structure 2 upon which the `forward end of the trailer member 3 is supported. This fifth wheel structure isprovided with a central hollow hub 4. A bearing member 5 arranged at the low- Y er end of the hub has supported therein a vertically movable pinp which has, preferably, an enlarged rounded head 7. V

- The lower 'end of the pin 6 rests upon the angle-shaped arm 8 of the rocker member 9, which rocker member is mounted on a shaft 10 mounted in suitable bearings transversely arranged in the truck frame. A crank arm 1'1 is mounted on the outer cylinder can be operated effectively from the end ofthe shaft r10 and has connected thereto a rod 12 which extends forwardly along-- side of the chassis of the tractor 1 and is connected to a swinging arm 13 pivotally mounted on the chassis.

The arm 13 is connected by a rod 14 to the brake lever 15 mounted in the cabof the tractor.

A shaft 16 is arranged transversely of the trailer frame and has mounted thereon an arm 17 which engages the rounded head 7 of the pin 6. The arm 17 is rigidly secured to the shaft 16 and an arm 18 also rigidly secured to the said shaft at its outer end is connected by a rod 19 to the operating lever O cf the master cylinder 21 of the hydraulic ra e. A

The cylinder 21 is connected by means of the piping 22 to the brake operating cylinders 23 on the rear axle of the trailer 3.

A rod 24 is pivotally connected to the arm 18 mounted on the shaft 16 and extends forwardly therefrom and is provided with a slotted shackle end 25 which engages the crank arm 26 of a brake lever 27 mounted on the trailer frame.

The brake lever on the trailer frame is coupled with the means for operating the master cylinder 21 on the-trailer so that the trailer brake may be operated when .the

, trailer is separated 'from the tractor.

It will be readily understood that as the master brake cylinder for the trailer brake is mounted on the trailer frame, the mechanisrn for connecting the operating lever thereof through the centre of the fifth wheel is' extremely Simple, it is easy 'to install and adds very little cost to the vehicle, v

The application of a reliable brake element on the pivotal trailer undoubtedly enhances 90 `thevalue of the whole structure as a safe,

transportation device.

lVhat we claim as our invention is:

1. In a brake for truck trailers,`the combination with a truck andr a trailer pivotally connected thereto, of brakes onthe trailer, a hydraulic' cylinder mounted on the trailer connected with lsaid brakes, said cylinder having an operating lever, mechanical means operating through the pivotal connection be- Loo' 2- Y i -v 1,860,537

tween said trailer and truck for actuating the operating lever of said h draulic cylinder from the truck, and manually operable-means mounted on said trailer` and ,operatively conti nected with said operating lever.

2. In a brake for truck trailers,the combination with the truck having a 'fifth wheel thereon andra trailer pivotally connected to the ifth wheel, of hydraulic brakes arranged on the' trailer, a hydraulic cylinder mounted on the trailer and connected with said brakes and havingan operating arm, a rod extending from said operating arm, a lever member operatively connected to said rod, apin centrally arranged in the fifth wheel'and operati-I ing said lever, means mounted in the truck adapted to operate said pin and through said pin said brake operatingv lever, and means mounted on said trailer for operating said y hydraulic cylinder lever independent of the aforesaid operating means.

3. Ina brake for truck trailers, the conibin'ation with a truck having a fifth wheel at the rear end, and a trailer having a for- .ward end mounted on the fifth wheel, of a pin slidablymounted centrally of the fifth wheel, means on the truck for raising and lowering said pin at will, a shaft mounted transversely of the trailer frame having an arm rigs-idly mounted thereon engaging, the upper of said pin, an arm rigidly secured at trailer respectively adapted to be operated selectively, and mechanical means includingcooperating link'and lever members forming' a flexible operative connection between sai res ective means and the operable portion of said hydraulic brake cylinder on said trailer whereby the latter may be operated independently fromv said trucker trailer. v

6. A brake for truck trai-1ers, comprising, in combination, a hydraulic brake cylinder mounted on the trailer frame, brakes operatively connected with said cylinder, a truck connected with said trailer, means mounted on said truck and trailer respectively adapted to be operated selectively, and mechanical means including a lost motion device vinterposed between one of said selectively operable means and the other of said means forming an operative connection between said respective means and the hydraulic cylinder on said trailer whereby the latter may be operated independentl from said truck or trailer.

4 W LLIAM-S. GURTON.

JOSEPH P LNT. HERMAN lNYBERG.

the outward end of the lshaft a h draulic .y

master brake cylinder mounted in t e trailer frame, brakes for the trailer operated from said hydraulic cylinder, an -operating lever for said hydraulic cylinder, a rod connecting the operating lever of the hydraulic cylinder to the arm on the 'outer end of said shaft, a rod pivotally connected to the -arm on the outer end of the shaft and extending forwardly and having a slotted shackle on the `end thereof, and a brake lever mounted on the forward end of the trailer frame operatively connected vith the slotted shackle. t 46 4. Abrake for truck trailers, comprising in combination a hydraulic brake cylinder mounted on the trailer frame and having an operatin member, .brakes operatively connected with said cylinder, a truck connected 50 with the trailer, mechanical means operated fromthe truck and extending between said truck and trailer for operating the operating member of said t iler brake cylinder to apply the brakes on the, trailer, and means '55 mounted on said trailer having a combined 4 pivotal and sli operating connection with vsaid mechanic moana for electin an independent operation of said trailer rake cylmder.

00 .5. A brake for truck trailers, comprising in combination, a hydraulic brake -cylinder .`m ounted on the trailerl frame having an opeable portion, brakes operatively connected with said cylinder, a truck connected iwith 65 said trailer, means mounted o n said truckand 

